I have in my short WiFi life thought when an 802.11 station (WiFi) does carrier detect it would detect all parts of an ongoing frame transmission on the channel and defer its own transmission because of that. But it seems my understanding has been wrong.

The last week’s online discussions has open my eyes to another look at the protocol and the importance of detecting the 802.11 preamble.

In this article I will write about the uniqueness of the 802.11 preamble, how important it is to detect it and how long it travels

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Please, set your mind into an 802.11 station and think about what happens during the start of an 802.11 frame reception.
In the preamble there is a field called L-SIGNAL and one of the subfields is called Rate. If the rate indicates 6mbs the rest of the frame could be any of the available PHY types in the 802.11 standards.
In the 5GHz band, it could be either a non-HT, HT, VHT, HE SU, HE MU, MU Trigger-based, or HE ER frame format.
How will you differentiate between those types of frame formats, and receive and process it correctly?

No clue, read this article

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A WiFi Ghost frame is a term widely used in the WiFi community lately. It is not a part of the 802.11 standard, it is just a term many uses.

Some say it is a frame the receiver don’t hear, other say the receiver don’t understand. Both are wrong.

So what is it?. I will try to explain.

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